Cr12MoV模具鋼硬度，Cr12MoV 分級淬火工藝(1536236918)

　　850度預(yù)熱-1050度加熱-620度分級，時間一般為2-3分鐘-油冷卻至200度左右-(或260度貝氏體等溫)-520回火2-3次，每次2小時。

　　硬度在56—61HRC左右。

　　Cr12Mov熱處理 HRC60 解決裂紋的方法：

　　分析流程：

　　1 材料成份 原材料組織 3工件流程

　　4熱處理工藝 5開裂照片 6工件尺寸

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　　不能說硬度60HRC必須開裂。開裂的原因有很多，可以參考耿工的說明逐一檢查。開裂的原因有很多，可以參考耿工的說明逐一檢查。淬火后直接開裂可能有以下原因:

　　1)材料加熱過程不合適。

　　2)冷卻不當(dāng)，在Ms溫度低于快速冷卻，應(yīng)力過大。

　　3)工件截面尺寸差異過大，或孔洞較多，或應(yīng)力集中。

　　4)淬火加熱溫度過高，晶粒粗大，脆性大。過熱時晶界氧化或熔化。

　　5)工件未預(yù)熱，加熱速度過大導(dǎo)致加熱開裂。

　　6)原組織不良、網(wǎng)狀共晶碳化物或球化退火不良，或原料微裂紋，淬火時裂紋膨脹開裂。

　　7)重復(fù)淬火前未進(jìn)行中間退火。

　　8)淬火后未及時回火。

　　用260-280貝氏體等溫淬火1050，模具的韌性會大大提高，不會開裂。